cl1 = 1;
Point(1) = {0, 0, 0, cl1};
Point(2) = {1, 0, 0, cl1};
Point(3) = {1, 1, 0, cl1};
Point(4) = {0, 1, 0, cl1};
Point(5) = {0, 0, 1, cl1};
Point(6) = {1, 0, 1, cl1};
Point(7) = {1, 1, 1, cl1};
Point(8) = {0, 1, 1, cl1};
Line(1) = {1, 2};
Line(2) = {2, 3};
Line(3) = {3, 4};
Line(4) = {4, 1};
Line(5) = {5, 6};
Line(6) = {6, 7};
Line(7) = {7, 8};
Line(8) = {8, 5};
Line(9) = {1, 5};
Line(10) = {2, 6};
Line(11) = {3, 7};
Line(12) = {4, 8};
Line Loop(15) = {1, 2, 3, 4};
Plane Surface(15) = {15};
Line Loop(17) = {5, 6, 7, 8};
Plane Surface(17) = {17};
Line Loop(19) = {10, -5, -9, 1};
Plane Surface(19) = {19};
Line Loop(21) = {2, 11, -6, -10};
Plane Surface(21) = {21};
Line Loop(22) = {7, -12, -3, 11};
Plane Surface(22) = {22};
Line Loop(24) = {4, 9, -8, -12};
Plane Surface(24) = {24};
Surface Loop(26) = {17, 19, 21, 15, 22, 24};
Volume(26) = {26};
PEC = 999;
Physical Surface(PEC) = {17};
cl1 = 0;
Physical Volume(cl1) = {26};
